US7497887B2 - Device for separating impurities from the lubricating oil of an internal combustion engine - Google Patents

Device for separating impurities from the lubricating oil of an internal combustion engine Download PDF

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Publication number
US7497887B2
US7497887B2 US10/521,188 US52118805A US7497887B2 US 7497887 B2 US7497887 B2 US 7497887B2 US 52118805 A US52118805 A US 52118805A US 7497887 B2 US7497887 B2 US 7497887B2
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United States
Prior art keywords
screw cap
cap
connection means
filter element
rotational direction
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Expired - Fee Related, expires
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US10/521,188
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English (en)
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US20050236322A1 (en
Inventor
Dieter Baumann
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Ing Walter Hengst GmbH and Co KG
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Ing Walter Hengst GmbH and Co KG
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Assigned to HENGST GMBH & CO., KG reassignment HENGST GMBH & CO., KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: BAUMANN, DIETER
Publication of US20050236322A1 publication Critical patent/US20050236322A1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D35/00—Filtering devices having features not specifically covered by groups B01D24/00 - B01D33/00, or for applications not specifically covered by groups B01D24/00 - B01D33/00; Auxiliary devices for filtration; Filter housing constructions
    • B01D35/30—Filter housing constructions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/96—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor in which the filtering elements are moved between filtering operations; Particular measures for removing or replacing the filtering elements; Transport systems for filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D36/00—Filter circuits or combinations of filters with other separating devices
    • B01D36/04—Combinations of filters with settling tanks
    • B01D36/045—Combination of filters with centrifugal separation devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/005—Centrifugal separators or filters for fluid circulation systems, e.g. for lubricant oil circulation systems
    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10M—LUBRICATING COMPOSITIONS; USE OF CHEMICAL SUBSTANCES EITHER ALONE OR AS LUBRICATING INGREDIENTS IN A LUBRICATING COMPOSITION
    • C10M175/00—Working-up used lubricants to recover useful products ; Cleaning
    • C10M175/0058—Working-up used lubricants to recover useful products ; Cleaning by filtration and centrifugation processes; apparatus therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter
    • B01D2201/4015—Bayonet connecting means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/40—Special measures for connecting different parts of the filter
    • B01D2201/4084—Snap or Seeger ring connecting means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/10—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters
    • F01M2001/1028—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification
    • F01M2001/1035—Lubricating systems characterised by the provision therein of lubricant venting or purifying means, e.g. of filters characterised by the type of purification comprising centrifugal filters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S55/00—Gas separation
    • Y10S55/17—Compressed air water removal

Definitions

  • the present invention relates to a device for separating impurities from the lubricating oil of an internal combustion engine, said device comprising a filter element, wherein said filter element is arranged in a two-piece housing that is closed during operation of the device and comprises a stationary lower housing part and a removable upper screw cap and wherein said screw cap and said filter element comprise detachable connection means which can be brought into contact and are used to transmit axial tractive forces, wherein the filter element is removed from the housing by means of these connection means when the screw cap is rotated in its loosening rotational direction.
  • the present invention relates to a device for separating impurities from the lubricating oil of an internal combustion engine, said device comprising a filter element at its bottom and, on top of said filter element, a centrifuge with a rotor drivable by means of lubricating oil flowing through it, wherein said filter element and said centrifuge are arranged, one above the other, in a common two-piece housing that is closed during operation of the device and comprises a removable upper screw cap and a stationary lower housing part, wherein a removable intermediate cap is arranged in the housing between said filter element and said centrifuge, said intermediate cap and said filter element comprising first detachable connection means which can be brought into contact and are used to transmit axial tractive forces, and wherein said centrifuge, said intermediate cap and said filter element can be removed from the housing while the latter is in its open state.
  • a device of the first aforementioned type is, for example, known from DE 296 10 290 U1, which describes a device that is designed as a fluid filter and which provides that the upper end disk of the filter element is provided with locking tongues that are projecting towards the top and can be mounted elastically. With the device being in the assembled state, these locking tongues engage a continuous locking groove extending along the internal perimeter of the screw cap. This permits removal of the screw cap, along with the filter element, from the filter housing by rotating said screw cap in its loosening rotational direction, this allowing the filter element to be handled easily when being replaced, wherein it is not necessary to directly seize the dirty and oily filter element.
  • a used-up filter element is separated from the screw cap by canting the two parts against each other until the locking connection is undone. This requires canting beyond a certain angle to ensure that the locking connection will indeed be undone.
  • screw caps which provide only little lateral motional play for the filter element partially arranged therein, this especially being the case with relatively long screw caps, it is not possible to undo the locking connection by canting because the deflection angle required between the two parts fails to be achieved since the filter element touches the internal perimeter of the screw cap beforehand.
  • great effort is required to undo the locking connection by exerting a tractive force in an axial direction. To achieve this, the dirty filter element must be seized, and in this process, contaminated lubricating oil may easily be released into the environment.
  • a device of the second aforementioned type is known from DE 43 06 431 C1. If the screw cap, as a removable part of the housing of this known device, is rotated in its loosening rotational direction, initially only the screw cap, in its thread, moves away from the stationary part of the housing in an upward direction, whereas the centrifuge rotor that is arranged in the upper part of the housing remains in its position. After the housing cap has been removed, the rotor of the centrifuge is positioned in its lower bearing. In the next step, the centrifuge rotor can be removed. Thereafter, the intermediate cap is accessible. The intermediate cap must be pulled out of the lower part of the housing in an upward direction.
  • the intermediate cap takes along the filter element that is arranged below it, thus also removing it in an upward direction.
  • This taking along is initiated by the first detachable connection means between the intermediate cap and the upper end disk of the filter element.
  • the filter element can, by canting or by exerting a tractive force in axial direction, be disengaged from and pulled out of the intermediate cap, and a new filter element can be inserted in the intermediate cap and engaged therewith via the detachable connection means by exerting a thrust force in axial direction.
  • the device is then assembled in reverse order by first introducing the intermediate cap including filter element in the lower part of the housing.
  • the present invention aims at creating devices of the aforementioned type, which obviate the drawbacks described above and which allow, in particular, disassembly and assembly to be carried out in an easier, faster and cleanlier manner.
  • connection means can be brought into contact by rotating the screw cap in the loosening rotational direction thereof and can be disengaged by rotating the screw cap in the tightening rotational direction thereof.
  • connection means can, if necessary, be brought into contact and be disengaged by a simple rotary motion.
  • the device according to the invention ensures that, when the screw cap is rotated in its loosening rotational direction, the filter element also makes the movement of the screw cap away from the remaining filter housing in the manner desired.
  • this device also facilitates clean removal of the filter element from the filter housing because the filter element is, at the same time, taken along and out of the filter housing when the cap is removed, thus not having to be taken out of the filter housing separately by operating personnel.
  • connection means Proper functioning of this type of connection means is ensured irrespective of the amount of a possible lateral motional play of the filter element inside the screw cap because, for being engaged and disengaged, the connection means do not require any lateral motion but must only be rotated in relation to each other. This enables this type of connection means to be used to particular advantage in long screw caps which, when a formerly usual locking connection was used, caused problems in undoing said locking connection.
  • a first preferred further development of the device provides that the angle of rotation covered by the screw cap between the disengaged position and the engaged position of the connection means ranges from approximately 15 degrees to 30 degrees. With such a small angle of rotation, a very small and very quickly and easily executable manual rotary motion of the parts of the device that comprise the connection means in relation to each other suffices for engagement and disengagement.
  • a further embodiment of the device proposes that the filter-element-side connection means are formed by a concentric circle of snap-on hooks that is already present at an upper end disk of the filter element and that the associated connection means of the screw cap are formed by a ring with cam segments that is concentrically arranged at the bottom side of the upper part of said screw cap, wherein, in a first rotational position that can be adjusted by rotating in the tightening rotational direction, the circle of snap-on hooks can be moved in axial direction into the ring and out of the ring with the cam segments in relation to each other and wherein, in a second rotational position that can be adjusted by rotating in the loosening rotational direction, the circle of snap-on hooks that has been moved into the ring cannot be moved out of the ring with the cam segments in axial direction in relation to each other.
  • a further embodiment of the device provides that the ring with the cam segments is inserted in a recess of the screw cap as a separate component such that it can neither be rotated nor lost. This initially permits manufacture of the cap with the region of its recess being formed relatively easily. Subsequently, the ring is installed in this recess, wherein the two parts can be connected to each other by being mutually welded or glued or engaged such that they can neither be rotated nor lost.
  • a second solution to this problem is provided by the invention by a device of the second aforementioned type, characterized in that
  • the screw cap and the intermediate cap additionally comprise second detachable connection means that can be brought in contact and are used to transmit axial tractive forces
  • the second connection means can be brought into contact by rotating the screw cap in its loosening rotational direction in relation to the intermediate cap and can be disengaged by rotating the screw cap in its tightening rotational direction in relation to the intermediate cap, and
  • the first connection means can, in relation to the filter element, be brought into contact by rotating the screw cap in its loosening rotational direction, said screw cap taking along the intermediate cap, and can, in relation to the filter element, be disengaged by rotating the intermediate cap in opposite direction.
  • the contact required for transmission of tractive forces acting in axial direction is, to advantage, established only if it is indeed required, that is during disassembly of the device.
  • This contact is simply generated by rotating the screw cap in its loosening rotational direction, a step that is anyhow required for unscrewing the screw cap from the stationary part of the housing.
  • Both the first and the second connection means are brought into contact by the rotary motion of the screw cap in its loosening rotational direction.
  • the angle of rotation covered by the screw cap between the disengaged position and the engaged position of the first and second connection means in relation to the filter element is, altogether, ranging from approximately 45 degrees to 120 degrees. Owing to this angle of rotation that is relatively small despite two connection contacts that must be established and undone, said contacts are swiftly established when the screw cap is rotated in its loosening rotational direction, requiring only a short distance to be covered, and are likewise swiftly undone when the screw cap is rotated in its tightening rotational direction, again requiring only a short distance to be covered.
  • the intermediate cap has the shape of a bell and comprises at its outer perimeter axially extending fins each of which is provided with at least one broadening or aperture pointing in circumferential direction and that the screw cap comprises at its lower edge hooks or noses that are pointing in its loosening rotational direction and can be brought into contact with the broadenings or apertures by rotating the screw cap in its loosening rotational direction in relation to the intermediate cap and can be disengaged by rotating the screw cap in its tightening rotational direction in relation to the intermediate cap.
  • the fins that comprise the broadenings or apertures are, at the same time, used as stabilization and force diverting fins for reinforcing the intermediate cap and for diverting onto the screw cap such forces that are caused by an oil pressure below the intermediate cap in the interior region of the housing.
  • the fins assume two functions, thus minimizing the material and manufacturing expenditures required for achieving as many functions as possible.
  • the intermediate cap that is connected to said screw cap via the connection means that are now in contact and the filter element connected thereto are prevented from falling off and, thus, being damaged in an unintentional manner.
  • the broadenings or apertures on the one hand and/or the hooks or noses on the other hand are each provided with a slope or step at their surfaces that are brought into contact, said slope or step securing the engaged position.
  • the second connection means can also be arranged at a different point.
  • the intermediate cap has the shape of a bell and comprises, in a radially outer region of its upper side, several wings that are pointing in an axially upward direction, are spaced apart from each other in circumferential direction and are each provided with at least one broadening or aperture pointing in a circumferential direction or with a depression used as connection means and recessing in a radially inward direction and that the screw cap comprises at is lower edge hooks or noses as connection means that are pointing in the loosening rotational direction of the screw cap or in a radially inward direction, wherein said connection means can be brought into contact with the connection means of the intermediate cap by rotating the screw cap in its loosening rotational direction in relation to the intermediate cap and can be disengaged by rotating the screw cap in its tightening rotational direction in relation to the intermediate cap.
  • This embodiment has a particular
  • the second connection means are arranged and designed such that they overlap each other in the axial direction when the screw cap is placed onto the remaining housing before the thread engagement thereof.
  • the parts of the device can be joined to form pre-assembled units.
  • the wings comprise, at their radially outer end, a guide contour fitting in the interior region of the screw cap with motional play. This guide contour ensures that the intermediate cap, including the centrifuge rotor it is carrying, can be aligned in an exactly axial direction when being inserted in the screw cap, wherein it is ensured that an upper shaft end of a rotor shaft is positioned precisely in a shaft holding in the center of the upper inner side of the screw cap.
  • the filter element can already be attached to the other side of the intermediate cap so that the pre-assembled unit then, to advantage, comprises all of the parts to be installed in the housing and to be connected to the housing.
  • a considerable lubricating oil pressure is present below the intermediate cap, whereas the region above the intermediate cap is pressureless relative to ambient atmospheric pressure.
  • a step at or next to each of the wings is provided, said step projecting in a radially outward direction and forming the basis on which the lower edge of the screw cap is supported when the latter is in the tightened state.
  • the wings be connected to each other via a continuous circumferential collar or be joined to form a continuous circumferential collar.
  • a further measure to prevent additional manufacturing expenditures and to allow the use of current filter elements comprises filter-element-side connection means that are formed by a concentric circle of snap-on hooks that is already present at an upper end disk of the filter element and further comprises associated connection means of the intermediate cap that are formed by a ring with cam segments that is concentrically arranged at the bottom side of the upper part of said intermediate cap, wherein, in a first rotational position that can be adjusted by rotating in tightening rotational direction, the circle of snap-on hooks can be moved in axial direction into the ring and out of the ring with the cam segments in relation to each other and wherein, in a second rotational position that can be adjusted by rotating in loosening rotational direction, the circle of snap-on hooks that has been moved into the ring cannot be moved out of the ring with the cam segments in axial direction in relation to each other.
  • connection means that are anyhow present at the filter element and that are usually used for engagement of the intermediate cap or for direct engagement of the screw cap where filters without centrifuge are concerned. This prevents a special filter element from having to be made available.
  • the ring with the cam segments mentioned in the preceding paragraph is inserted in a recess of the intermediate cap such that it can neither be rotated nor lost.
  • the ring on the one hand and the intermediate cap on the other hand from different materials, wherein a material with the properties that are particularly suitable for the particular tasks can each be selected.
  • This also simplifies manufacture of the intermediate cap because its bottom side must only be provided with a recess in which the ring will then be inserted.
  • the manufacture of the ring as a separate component is, in particular, simplified if it is manufactured as an injection-molded part because its removing from the mold is not restricted by any parts of the intermediate cap.
  • connection means are preferably designed in the form of a bayonet lock or as a short-length thread.
  • the screw cap, the upper end disk of the filter element as well as the intermediate cap if necessary and, if need be, the ring with the cam segments are each single-piece injection-molded parts of plastic. This permits cost-effective bulk production and results in a low weight of the device.
  • the screw cap including its ring with the cam segments or the intermediate cap including its ring with the cam segments can each be a single-piece injection-molded part of plastic. This is to advantage in that it reduces the number of component parts and the number of mounting steps.
  • FIG. 1 is a lateral view and partial vertical sectional view of a first device for separating impurities from the lubricating oil of an internal combustion engine, comprising a filter element, in a securely assembled state;
  • FIG. 2 is a view of the device of FIG. 1 in a state where a screw cap of the device is being rotated in its loosening rotational direction, in the same type of representation as in FIG. 1 ;
  • FIG. 3 is a lateral view, a partial vertical sectional view and a partially broken view of a second device for separating impurities from the lubricating oil of an internal combustion engine comprising a filter element and a centrifuge, in a securely assembled state;
  • FIG. 4 is an oblique top view of the device of FIG. 3 in partially open representation and with individual parts of the device having been omitted;
  • FIG. 5 is a view of the device of FIG. 3 in the same type of representation as in FIG. 3 , however, now with the screw cap being in a first rotational position at the start of being rotated in its loosening rotational direction on opening of the device;
  • FIG. 5 a is a view of the detail encircled in FIG. 5 , in a modified embodiment
  • FIG. 6 is a view of the device of FIG. 5 in the same type of representation as in FIG. 3 and in the same rotational state as in FIG. 3 ;
  • FIG. 7 is a view of the device of FIG. 3 with the screw cap being in a rotational state where it has been further rotated in its loosening rotational direction, in the same type of representation as in FIG. 3 and in FIG. 5 ;
  • FIG. 8 is a view of the device of FIG. 7 in the same type of representation as in FIGS. 4 and 6 in the rotational state according to FIG. 7 ;
  • FIG. 9 is a vertical sectional view of a third device for separating impurities from the lubricating oil of an internal combustion engine comprising a filter element and a centrifuge, in a securely assembled state;
  • FIG. 10 is a partially broken perspective view of the device of FIG. 9 , with the centrifuge rotor and the filter element having been omitted, with tightened screw cap;
  • FIG. 11 is a view of the device of FIG. 9 in the same type of representation as in FIG. 10 , however, now with partially loosened screw cap;
  • FIG. 12 is a view of the device of FIG. 9 in the same type of representation as in FIGS. 10 and 11 , however, now with fully loosened screw cap.
  • the represented first embodiment of a device 1 for separating impurities from the lubricating oil of an internal combustion engine is designed as a pure filter.
  • the device possesses a housing 4 that comprises a stationary lower housing part 42 and an upper screw cap 41 connected thereto in a detachable manner.
  • ducts In a lower part of the filter housing 4 , which is not shown in FIG. 1 , ducts, at least for supplying lubricating oil to be purified and for discharging purified lubricating oil, are provided in the usual manner.
  • the lower housing part 42 and the screw cap 41 can be connected to and separated from each other by means of a screw thread that is rotated.
  • the arrow 41 ′′ on the screw cap 41 indicates the tightening rotational direction of said screw cap 41 .
  • the screw cap 41 is securely screwed to the lower housing part 42 and is sealed by a gasket.
  • a filter element 2 that has the usual executive form and consists of a filter medium body 21 that is concertina-folded and bent to form a circular hollow cylinder is arranged in the interior region of the housing 4 . At each of its two face ends, the filter medium body 21 is connected to an end disk in a sealing manner, wherein only the upper end disk 22 is visible in FIG. 1 .
  • a circle of snap-on hooks 24 that is, in conventional filters for the lubricating oil of an internal combustion engine, used for establishing a locking connection between screw cap and filter element extends from the upper side of the end disk 22 in an upward direction.
  • connection means 25 which can, optionally, be engaged and disengaged by means of connection means 45 .
  • the connection means 45 are arranged at the inner side of the screw cap 41 and radially at the immediate outside of the connection means 25 such that they fit to the latter.
  • connection means 45 are formed by a ring 46 with cam segments, said ring 46 being arranged concentrically about the longitudinal central axis of the screw cap 41 and being connected to the remaining screw cap 41 such that it can neither be rotated nor lost.
  • the cams of the cam segments of the ring 46 are positioned such that they are each positioned between two neighboring snap-on hooks 24 of the end disk 22 .
  • the connection means 25 , 45 are, here, disengaged.
  • the screw cap 41 when in the tightened position shown in FIG. 1 , ensures that the filter element 2 assumes a fixed position inside the housing 4 by the screw cap 41 entering in abutment against the upper side of the upper end disk 22 of the filter element 2 .
  • FIG. 2 of the drawing shows the device 1 of FIG. 1 in the same view, however, now in a second operating state where the screw cap 41 is rotated in its loosening rotational direction.
  • the arrow 41 ′ indicates the loosening rotational direction of the screw cap 41 .
  • the screw cap 41 By being rotated in its loosening rotational direction, the screw cap 41 is rotated not only in relation to the stationary housing part 42 of the housing 4 but, in the same sense, also in relation to the filter element 2 .
  • the filter element 2 comprises, at its lower end, a central aperture in its lower end disk, said aperture being positioned on a connection piece by means of an axial and/or radial seal.
  • the cam segments present at the ring 46 enter a position opposite to the snap-on hooks 24 .
  • the cam segments of the ring 46 and the snap-on hooks 24 are positioned opposite to each other, it is no longer possible to further rotate the screw cap 41 and the filter element 2 in relation to each other in the same directional sense because this is prevented by stops provided in the ring 46 .
  • the connection means 25 , 45 are now engaging each other.
  • the filter element 2 Since the screw cap 41 and the filter element 2 can no longer be rotated further in the same directional sense and in relation to each other beyond the measure achieved, the filter element 2 , while the screw cap 41 is further rotated in its loosening rotational direction, is also further rotated synchronously with the screw cap 41 , wherein the connection means 25 , 45 are still engaging each other.
  • connection means 25 , 45 are able to transmit an appropriate axial tractive force from the screw cap 41 to the filter element 2 , so that the latter, while overcoming the friction on its connection piece, is moved upwards together with the screw cap 41 when the latter is rotated in its loosening rotational direction, thus being finally moved out of the filter housing 4 .
  • connection means 25 , 45 to be disengaged, so that the filter element 2 can be pulled out of the screw cap 41 in axial direction without a tractive force having to be applied and without a canting motion having to be made for disengagement.
  • a new filter element 2 including its connection means 25 , can first be introduced in the screw cap 41 in axial direction and can then, by shortly rotating the screw cap 41 in its loosening rotational direction in relation to the filter element 2 , be connected to the latter, thus causing the connection means 25 , 45 to be brought into contact.
  • the screw cap 41 can be seized and, jointly with the filter element 2 , be moved to the lower stationary housing part 42 and can then be reconnected to the latter by a rotary motion.
  • connection means 25 , 45 between the screw cap 41 and the filter element 2 disengage when the screw cap 41 is rotated in its tightening rotational direction, this is of no relevance here, because now the filter element 2 is already positioned on its connection piece with its lower end.
  • the thrust force required for further pushing the filter element 2 onto the connection piece is transmitted by the screw cap 41 onto the upper side of the upper end disk 22 where there is an immediate abutment of these two parts against each other.
  • the represented second embodiment of the device 1 for separating impurities from the lubricating oil of an internal combustion engine also comprises a housing 4 , which is formed by a lower stationary housing part 42 and an upper screw cap 41 .
  • the screw cap 41 can be screwed into the stationary housing part 42 by means of the threaded connection 43 that is sealed by a gasket, wherein the screw cap 41 is shown in FIG. 1 in its securely tightened state.
  • a filter element 2 in the form of a filter medium body 21 with an upper end disk 22 and a lower end disk that is not visible here is arranged in the lower part of the housing 4 .
  • a centrifuge 3 comprising a rotor 31 that is pivoted on a rotational axis 32 is provided in the upper part of the housing 4 flush with and above the filter element 2 .
  • the interior region of the housing 4 is subdivided in a lower region 40 and an upper region 40 ′ by a bell-shaped intermediate cap 5 .
  • the intermediate cap 5 comprises an upper part 50 that is arranged above the filter element 2 and below the rotor 31 of the centrifuge 3 .
  • a circumferential wall 51 extends down from the outer edge of the upper part 50 of the intermediate cap 5 . At its lower end, said circumferential wall 51 is inserted in the stationary housing 42 in a sealing manner by means of a gasket 51 ′.
  • the pressure present below the intermediate cap 5 is the operating oil pressure; above the intermediate cap 5 , there is a pressureless region 40 ′ for draining the oil exiting out of the centrifuge rotor 31 , wherein the region 40 ′ is usually connected to an oil pan of the associated internal combustion engine.
  • the lower end of the rotor axis 32 is held centrally in the upper side of the upper part 50 of the intermediate cap 5 .
  • the upper end of the rotor axis 32 is mounted centrally in the upper end region of the inner side of the screw cap 41 .
  • Connection means 23 , 53 that can optionally be engaged with and disengaged from each other are arranged between the upper end disk 22 and the intermediate cap 5 .
  • the connection means provided at the end disk 22 are formed by a circle 23 of snap-hooks that is formed by several hooks 24 that are projecting upwards, are spaced apart from each other and are each comprising a nose 26 pointing in radially outward direction.
  • a ring 53 that is provided as intermediate-cap-side connection means is arranged in a radial direction outside of this circle 23 of snap-on hooks, wherein the ring 53 is provided with cam segments enabling optional engagement with or disengagement from the circle 23 of snap-on hooks.
  • the ring 53 with the cam segments is inserted as a separate component in a suitable recess 52 of the intermediate cap 5 from below and is held in the aperture 52 such that it can neither be rotated nor lost.
  • Second connection means are provided between the lower end of the screw cap 41 and the outer perimeter of the intermediate cap 5 .
  • the connection means are formed by hooks 44 that are pointing in circumferential direction and in the loosening rotational direction of said screw cap 41 and are formed to fit to the lower edge of the screw cap 41 .
  • fins 56 having broadenings 54 at their upper end and extending in axial direction are formed to fit to the outer side of the circumferential wall 51 of said intermediate cap 5 .
  • the broadenings 54 and the hooks 44 form the connection means which optionally engage with or disengage from each other, depending on the rotational state.
  • FIG. 3 shows the device 1 in a state where the screw cap is securely screwed to the stationary part 42 of the housing 4 .
  • This position is achieved by rotating the screw cap 41 in its tightening rotational direction 41 ′′.
  • both the first connection means 23 , 53 and the second connection means 44 , 54 are disengaged, because these parts have been rotated in relation to each other when the screw cap 41 was rotated in its tightening rotational direction such that the engagement of the mentioned connection means is undone.
  • the connection means 23 , 53 and 44 , 54 are not able to transmit any forces in axial direction, this not being necessary when the device 1 is in the assembled state.
  • FIG. 4 the device 1 shown in FIG. 3 is represented in perspective in an oblique top view, with some parts of the device 1 having been omitted.
  • the centrifuge 3 has been omitted for reasons of clarity.
  • FIG. 2 only shows the ring 53 forming the connection means.
  • the filter element 2 can be seen with its upper end disk 22 from the upper side of which the circle 23 of snap-on hooks projects with the individual hooks 24 that are each provided with a nose 26 pointing in an outward direction.
  • the ring 53 that forms a part of the intermediate cap 5 that is not represented cooperates with said circle 23 of snap-on hooks.
  • FIG. 4 the device 1 shown in FIG. 3 is represented in perspective in an oblique top view, with some parts of the device 1 having been omitted.
  • the centrifuge 3 has been omitted for reasons of clarity.
  • FIG. 2 only shows the ring 53 forming the connection means.
  • the filter element 2 can be seen with its upper end disk 22 from the upper side of which the circle
  • FIG. 5 of the drawing shows the device 1 after the screw cap 41 has been rotated in its loosening rotational direction by approximately 45 degrees.
  • the screw cap 41 By this rotation of the screw cap 41 , the latter's hooks 44 are brought into contact with the broadenings 54 , as can be seen from the detail encircled in FIG. 5 .
  • the surfaces of the connection means 44 , 54 that are brought into contact with each other are designed in the form of straight lines.
  • a modification according to FIG. 5 a can be provided.
  • the surfaces or regions of the connection means 44 , 54 that are brought into contact with each other are each provided with a step 47 , 57 .
  • FIG. 6 shows the device 1 with the screw cap 41 being in the rotational state already shown in FIG. 5 , in perspective and in an oblique top view in the same type of representation as in FIG. 4 .
  • FIG. 6 illustrates that the screw cap 41 has now been rotated in its loosening rotational direction 41 ′ by approximately 45 degrees, as compared with its position shown in FIG. 4 .
  • This rotation only involves the screw cap 41 because the latter's rotation has not yet been transmitted to the intermediate cap 5 .
  • the connection means 23 of the upper end disk 22 of the filter element 2 and the connection means 53 forming a part of the intermediate cap 5 that is not shown in FIG. 4 are still disengaged.
  • FIG. 7 shows the device 1 in a state where the screw cap 41 is still further rotated in its loosening rotational direction 41 ′. Since it has been further rotated in this manner, the screw cap 41 takes along the intermediate cap 5 in its loosening rotational direction, because the hooks 44 run against the broadenings 54 . As a result, the intermediate cap 5 now rotates in relation to the filter element 2 such that the connection means 23 of the filter element 2 and the connection means 53 of the intermediate cap 5 are now brought into contact, as it is visible at the connection means 23 , 53 above the upper end disk 22 .
  • the filter element 2 can be separated from the intermediate cap 5 simply by shortly rotating the two parts in relation to each other in a rotational direction opposite to the previous rotational direction, whereby undoing of the engagement of the connection means 23 , 53 and pulling the filter element 2 out of the intermediate cap 5 in an axially downward direction can be achieved without any special effort being required.
  • This is to particular advantage in devices 1 where the intermediate cap 5 covers the filter element 2 across a major part of the latter's height, because the usual canting required to achieve disengagement would not be possible here.
  • a likewise short rotation in a direction opposite to the previous rotational direction is sufficient to separate the intermediate cap 5 from the screw cap 41 , causing the connection means 44 , 54 to disengage. In this manner, it is possible to remove the screw cap 41 from the intermediate cap 5 in axial direction. As a result, the centrifuge becomes, at the same time, accessible for a replacement of the centrifuge rotor 31 if this becomes necessary.
  • the individual parts of the device 1 are assembled in reverse order and with opposite rotational directions. Thereafter, a joined unit comprising screw cap 41 , centrifuge 3 , intermediate cap 5 and filter element 2 can jointly be connected to the stationary part 42 of the housing 4 by rotating the screw cap 41 in the tightening rotational direction thereof.
  • FIG. 8 shows the device 1 in the state according to FIG. 7 , however, now in perspective and in an oblique top view with individual parts having been omitted and in a partially open view.
  • This figure illustrates that, now, the screw cap 41 has been rotated still further in its loosening rotational direction.
  • this causes the intermediate cap 5 that is not shown in FIG. 8 to be also rotated together with the ring 53 with the cam segments that is attached thereto such that it cannot be rotated.
  • the ring 53 is rotated in relation to the filter element 2 and to the circle 23 of snap-on hooks that are arranged on the upper end disk 22 of said filter element 2 .
  • the connection means 23 , 53 are in engagement so that an axial tractive force can be transmitted from the intermediate cap 5 to the filter element 2 via the connection means 23 , 53 .
  • FIGS. 9 through 12 show a third embodiment of a device 1 , which also comprises a centrifuge 3 and a filter element 2 inside a common housing 4 .
  • the longitudinal section according to FIG. 9 shows this arrangement in the housing 4 , with the centrifuge 3 at the top and the filter element 2 at the bottom.
  • the housing 4 is provided with a stationary lower housing part 42 and a screw cap 41 that is connected thereto via a thread 43 and can be rotated in its loosening rotational direction.
  • the intermediate cap 5 subdivides the interior region of the housing 4 in a lower housing region 40 that accepts the filter element 2 and an upper housing part 40 ′ that accepts the centrifuge 3 .
  • the intermediate cap 5 has the approximate shape of a bell and possesses a curved upper part 50 as well as a circumferential region 51 arranged adjacent thereto in downward direction.
  • a gasket 51 ′ is inserted in a groove that points in a radially outward direction, thus causing the intermediate cap 5 to be positioned in the lower part 42 of the housing 4 in a sealing manner.
  • Connection means 53 that are brought into contact with the connection means 23 at the upper side of the upper end disk 22 of the filter element 2 are arranged at the bottom side of the upper part 50 of the intermediate cap 5 .
  • These connection means 23 , 53 permit axial tractive forces from the intermediate cap 5 to be applied to the filter element 2 with its filter medium body 21 .
  • the connection means 23 on the side of the filter element 2 are formed by a circle of locking hooks 24 with locking noses 26 .
  • the connection can, here, be designed as a locking connection or as a rotary connection.
  • the centrifuge 3 comprises a centrifuge rotor 31 that is pivoted on a rotor axis 32 . With its lower end, this rotor axis 32 is seated in an appropriate recess in the upper side of the intermediate cap 5 . With its upper end, the rotor axis 32 is seated in an appropriate central recess at the inner side of the screw cap 41 .
  • connection means 45 , 54 that can optionally be engaged and disengaged by rotating the screw cap 41 are provided between the screw cap 41 and the intermediate cap 5 in this embodiment of the device 1 as well. In the state of the device 1 shown in FIG. 9 , where the screw cap 41 is completely and securely tightened, the connection means 45 , 54 are disengaged.
  • lubricating oil to be purified flows through an inlet that is not visible, first into the lower housing region 40 and, from there, from without inward in a radial direction through the filter medium body 21 .
  • a part of this lubricating oil that has flown through this filter medium body 21 flows up and into the centrifuge 3 and, after having left the centrifuge rotor 31 , from there into the upper housing region 40 ′.
  • This housing region 40 ′ is pressureless and connected to the oil pan of an associated internal combustion engine via a return line that is not shown here.
  • the full oil pressure is present in the housing region 40 below the screw cap 5 .
  • the intermediate cap 5 comprises outwardly projecting steps 59 in a radially outward region at its upper part 50 .
  • the screw 41 rests on said steps 59 with its bottom edge 49 .
  • the intermediate cap 5 is secured in its position and can absorb the force caused by the pressure difference and divert it to the housing 4 of the device 1 without any difficulties.
  • the device 1 according to FIG. 9 provides the possibility of being pre-assembled to a considerable extent.
  • the filter element 2 is first brought into contact with the connection means 53 at the intermediate cap 5 via its own connection means 23 .
  • the rotor shaft 32 including the centrifuge rotor 31 arranged on top of it, can be inserted in the intermediate cap 5 from above.
  • this pre-assembled unit comprising filter element 2 , intermediate cap 5 and centrifuge 3 is introduced into the screw cap 41 from below until the upper end of the rotor axis 32 is seated appropriately in the associated recess on the inner side of the cap 41 .
  • This pre-assembled unit that now also comprises the screw cap 4 can then be connected to the stationary housing part 40 of the device 1 by rotating the screw cap 41 in the tightening rotational direction thereof.
  • the intermediate cap 5 is, here, equipped with several outwardly and upwardly extending wings 56 ′ in the radially outer region of its upper part 50 .
  • the wings 56 ′ are distributed over the intermediate cap 5 in circumferential direction and at uniform intervals, wherein a total of four wings 56 ′ are, here, provided at intervals of 90 degrees each.
  • each wing 56 ′ possesses a guide contour 59 that is extending in axial direction and fits in the interior region of the lower part of the screw cap 41 with a little motional play.
  • This guide contour 58 ensures that there will be no cantings when the intermediate cap 5 and the screw cap 41 are joined together. On the contrary, the joining together is inevitably effected at an exactly axial orientation, this being ensured by the guide contour 58 . At the same time, this ensures that the upper end of the rotor axis 32 always accurately enters in the associated recess on the inner side of the screw cap 41 .
  • FIG. 10 shows the device 1 of FIG. 9 in perspective in an open view, wherein, here, the filter element and the centrifuge rotor have been omitted for reasons of clarity.
  • the cap 41 of the housing 4 is in its fully tightened position.
  • the tightening rotational direction of the screw cap 41 is indicated by the rotary arrow 41 ′′.
  • FIG. 10 shows the arrangement and distribution of the wings 56 ′ on the intermediate cap 5 particularly clearly.
  • each wing 56 ′ possesses the guide contour 58 that has already been described above and that extends in axial direction of the screw cap 41 .
  • each wing 56 ′ possesses a rectangular aperture that is open in radially outward direction and that forms the connection means 54 to engage the connection means 45 at the screw cap 41 .
  • connection means 45 , 54 are disengaged.
  • the connection means 45 at the screw cap 41 only abut against the wings 56 ′ as seen in circumferential direction, wherein a rotary motion, but not an axial tractive force, can be transmitted from the screw cap 41 to the intermediate cap 5 in tightening rotational direction.
  • a step 59 projecting in outward direction is formed to fit to the intermediate cap 5 .
  • These steps 59 are used to divert axial forces that are caused by the pressure difference between the bottom side and the upper side of the intermediate cap 5 .
  • the screw cap 41 When the screw cap 41 is in the tightened state, its lower edge 49 that is positioned in the region of the connection means 45 rests on these steps 59 .
  • the developing forces that are acting in an axially upward direction are widely diverted onto the screw cap 41 and, via the thread 43 , to the remaining part of the housing 4 .
  • FIG. 11 of the drawing now shows the device 1 of FIG. 1 and FIG. 10 at the beginning of rotating the screw cap 41 in its loosening rotational direction.
  • the loosening rotational direction is represented by the rotary arrow 41 ′.
  • connection means 45 at the screw cap 41 are brought into contact with the connection means 54 at the intermediate cap 5 , as can be seen to the upper left of FIG. 11 . Since the screw cap 41 is represented in a broken view in FIG. 11 , the three further connection means 45 of the screw cap 41 cannot be seen, but they engage the further connection means 54 of the intermediate cap 5 in the same manner.
  • the intermediate cap 5 is also turned in the loosening rotational direction thereof as well as taken along in an axially upward direction in the manner desired, thus being moved out of the lower part 42 of the housing 4 .
  • FIG. 12 finally shows the screw cap 41 in a state where it is completely loosened and separated from the lower part 42 of the housing 4 .
  • the thread 43 is now disengaged from the screw cap 41 and the lower housing part 42 .
  • the individual parts of the device 1 that have initially been detached jointly from the stationary housing part 42 can now be separated from each other by a simple rotary motion and the parts to be exchanged, here the centrifuge rotor and the filter element, can be replaced.
  • connection means 45 project a little in downward direction, thus causing the lower edge 49 of the screw cap 41 to be positioned a little lower than the lower edge of the thread 43 at the screw cap 41 .
  • the wings 56 ′ at the intermediate cap 5 project in an axially upward direction to such an extent that the connection means 45 of the screw cap 41 and the wings 56 ′ of the intermediate cap 5 overlap each other before the threads 43 engage each other.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Lubrication Details And Ventilation Of Internal Combustion Engines (AREA)
  • Centrifugal Separators (AREA)
US10/521,188 2002-07-12 2003-02-13 Device for separating impurities from the lubricating oil of an internal combustion engine Expired - Fee Related US7497887B2 (en)

Applications Claiming Priority (3)

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DE20211556.9 2002-07-12
DE20211556U DE20211556U1 (de) 2002-07-12 2002-07-12 Vorrichtung zum Abtrennen von Verunreinigungen aus dem Schmieröl einer Brennkraftmaschine
PCT/EP2003/001412 WO2004007052A1 (de) 2002-07-12 2003-02-13 Vorrichtung zum abtrennen von verunreinigungen aus dem schmieröl einer brennkraftmaschine

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US7497887B2 true US7497887B2 (en) 2009-03-03

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US (1) US7497887B2 (de)
EP (1) EP1521626B1 (de)
BR (1) BR0307256B1 (de)
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US20070232475A1 (en) * 2003-08-13 2007-10-04 Dieter Baumann Device for Eliminating Impurities from the Lubricating Oil of an Internal Combustion Engine
US20130340399A1 (en) * 2011-02-28 2013-12-26 Mann+Hummel Gmbh Filter Device Having an Annular Filter Element
US20150053603A1 (en) * 2013-08-23 2015-02-26 Mann+Hummel Gmbh Filtration Apparatus
US9447758B2 (en) 2010-03-24 2016-09-20 Ufi Filters S.P.A. Filter for internal combustion engines

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DE202004018743U1 (de) * 2004-12-04 2006-04-13 Hengst Gmbh & Co.Kg Zentrifuge für die Reinigung einer Flüssigkeit
DE202007017614U1 (de) * 2007-12-14 2009-04-30 Mann + Hummel Gmbh Ölfilter
DE202008004289U1 (de) * 2008-03-27 2010-04-08 Mann+Hummel Gmbh Filterverschlusssystem mit Bajonett
DE102010054716A1 (de) * 2010-12-16 2012-06-21 Hydac Process Technology Gmbh Filtervorrichtung
ITRE20110028A1 (it) 2011-04-20 2012-10-21 Ufi Innovation Ct Srl Gruppo filtrante
DE102014110583A1 (de) 2014-07-28 2016-01-28 Hengst Se & Co. Kg Vorrichtung zum Abtrennen von Verunreinigungen aus dem Schmieröl einer Brennkraftmaschine
GB2551830B (en) * 2016-06-30 2020-09-23 Adey Holdings 2008 Ltd Magnetic rod guide for a filter
EP3551315B1 (de) 2016-12-06 2022-06-08 MANN+HUMMEL GmbH Endscheibe, filterelement mit endscheibe und filtersystem
IT201900022791A1 (it) * 2019-12-03 2021-06-03 Oil Service S R L Procedimento per la rimozione di impurita’ da olio diatermico ed apparecchiatura che attua tale procedimento
CN114797299B (zh) * 2022-04-14 2023-08-01 张家港澳卓尔生物技术装备有限公司 一种可拆卸的旋风式滤筒除尘器
CN115054972B (zh) * 2022-07-15 2023-01-06 全能管业科技(衢州)有限公司 一种节能环保污水排出管道及其使用方法

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US7867158B2 (en) * 2003-08-13 2011-01-11 Hengst Gmbh & Co. Kg Device for separating impurities from the lubricating oil of an internal combustion engine
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US20130340399A1 (en) * 2011-02-28 2013-12-26 Mann+Hummel Gmbh Filter Device Having an Annular Filter Element
US9101864B2 (en) * 2011-02-28 2015-08-11 Mann+Hummel Gmbh Filter device having an annular filter element
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Also Published As

Publication number Publication date
DE20211556U1 (de) 2003-11-20
WO2004007052A1 (de) 2004-01-22
EP1521626A1 (de) 2005-04-13
EP1521626B1 (de) 2005-11-16
BR0307256B1 (pt) 2011-04-05
BR0307256A (pt) 2004-12-14
DE50301701D1 (de) 2005-12-22
US20050236322A1 (en) 2005-10-27

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